Rising Spell Force stacks are acquired per target hit, not per spell that hits a target.
Minions hit by Essence Flux do not accrue Rising Spell Force stacks.
Ezreal will also gain Rising Spell Force stacks from hitting allied champions with Essence Flux.
Cooldown: 6 / 5.5 / 5 / 4.5 / 4
Cost: 28 / 31 / 34 / 37 / 40 Mana
Active: Ezreal fires a bolt of energy in a line that will deal physical damage and apply on-hit effects to the first enemy it hits. If it strikes an enemy unit, all of Ezreal's cooldowns will be reduced by 1 second.
Mystic Shot's inbuilt cooldown reduction will also apply to itself. With maximum cooldown reduction, it will have a cooldown of 2.4 seconds, or 1.4 seconds when striking a target.
Cost: 50 / 60 / 70 / 80 / 90 Mana
Active: Ezreal fires a wave of energy in a line. Any enemy champions it passes through are dealt magic damage, while any allied champions it travels through have their attack speed increased for 5 seconds.
Arcane Shift's cast time cannot be interrupted by anything other than Ezreal's own death. He will still suffer any crowd control effects, duration permitting, after it ends.
Arcane Shift's homing projectile can target and hit stealthed units.
Cost: 100 Mana
Active: After gathering energy for 1 second, Ezreal fires a powerful, broad energy missile that travels in a line across the whole map dealing magic damage to each enemy unit it passes through. It will deal 10% less damage for each subsequent target hit, down to a minimum of 30% damage dealt.